+//! Definition of [`CValue`] and [`CPlace`]
+
use crate::prelude::*;
+use cranelift_codegen::ir::immediates::Offset32;
+
fn codegen_field<'tcx>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- base: Value,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ base: Pointer,
extra: Option<Value>,
- layout: TyLayout<'tcx>,
+ layout: TyAndLayout<'tcx>,
field: mir::Field,
-) -> (Value, TyLayout<'tcx>) {
+) -> (Pointer, TyAndLayout<'tcx>) {
let field_offset = layout.fields.offset(field.index());
let field_layout = layout.field(&*fx, field.index());
- let simple = |fx: &mut FunctionCx<_>| {
- if field_offset.bytes() > 0 {
- (
- fx.bcx.ins().iadd_imm(base, field_offset.bytes() as i64),
- field_layout,
- )
- } else {
- (base, field_layout)
- }
+ let simple = |fx: &mut FunctionCx<'_, '_, '_>| {
+ (base.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap()), field_layout)
};
if let Some(extra) = extra {
if !field_layout.is_unsized() {
return simple(fx);
}
- match field_layout.ty.kind {
- ty::Slice(..) | ty::Str | ty::Foreign(..) => return simple(fx),
+ match field_layout.ty.kind() {
+ ty::Slice(..) | ty::Str | ty::Foreign(..) => simple(fx),
ty::Adt(def, _) if def.repr.packed() => {
assert_eq!(layout.align.abi.bytes(), 1);
- return simple(fx);
+ simple(fx)
}
_ => {
// We have to align the offset for DST's
let unaligned_offset = field_offset.bytes();
- let (_, unsized_align) = crate::unsize::size_and_align_of_dst(fx, field_layout.ty, extra);
+ let (_, unsized_align) =
+ crate::unsize::size_and_align_of_dst(fx, field_layout, extra);
- let one = fx.bcx.ins().iconst(pointer_ty(fx.tcx), 1);
+ let one = fx.bcx.ins().iconst(fx.pointer_type, 1);
let align_sub_1 = fx.bcx.ins().isub(unsized_align, one);
let and_lhs = fx.bcx.ins().iadd_imm(align_sub_1, unaligned_offset as i64);
- let zero = fx.bcx.ins().iconst(pointer_ty(fx.tcx), 0);
+ let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
let and_rhs = fx.bcx.ins().isub(zero, unsized_align);
let offset = fx.bcx.ins().band(and_lhs, and_rhs);
- (
- fx.bcx.ins().iadd(base, offset),
- field_layout,
- )
+ (base.offset_value(fx, offset), field_layout)
}
}
} else {
}
}
-fn scalar_pair_calculate_b_offset(tcx: TyCtxt<'_>, a_scalar: &Scalar, b_scalar: &Scalar) -> i32 {
- let b_offset = a_scalar
- .value
- .size(&tcx)
- .align_to(b_scalar.value.align(&tcx).abi);
- b_offset.bytes().try_into().unwrap()
+fn scalar_pair_calculate_b_offset(
+ tcx: TyCtxt<'_>,
+ a_scalar: &Scalar,
+ b_scalar: &Scalar,
+) -> Offset32 {
+ let b_offset = a_scalar.value.size(&tcx).align_to(b_scalar.value.align(&tcx).abi);
+ Offset32::new(b_offset.bytes().try_into().unwrap())
}
/// A read-only value
#[derive(Debug, Copy, Clone)]
-pub struct CValue<'tcx>(CValueInner, TyLayout<'tcx>);
+pub(crate) struct CValue<'tcx>(CValueInner, TyAndLayout<'tcx>);
#[derive(Debug, Copy, Clone)]
enum CValueInner {
- ByRef(Value),
+ ByRef(Pointer, Option<Value>),
ByVal(Value),
ByValPair(Value, Value),
}
impl<'tcx> CValue<'tcx> {
- pub fn by_ref(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
- CValue(CValueInner::ByRef(value), layout)
+ pub(crate) fn by_ref(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
+ CValue(CValueInner::ByRef(ptr, None), layout)
}
- pub fn by_val(value: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
+ pub(crate) fn by_ref_unsized(
+ ptr: Pointer,
+ meta: Value,
+ layout: TyAndLayout<'tcx>,
+ ) -> CValue<'tcx> {
+ CValue(CValueInner::ByRef(ptr, Some(meta)), layout)
+ }
+
+ pub(crate) fn by_val(value: Value, layout: TyAndLayout<'tcx>) -> CValue<'tcx> {
CValue(CValueInner::ByVal(value), layout)
}
- pub fn by_val_pair(value: Value, extra: Value, layout: TyLayout<'tcx>) -> CValue<'tcx> {
+ pub(crate) fn by_val_pair(
+ value: Value,
+ extra: Value,
+ layout: TyAndLayout<'tcx>,
+ ) -> CValue<'tcx> {
CValue(CValueInner::ByValPair(value, extra), layout)
}
- pub fn layout(&self) -> TyLayout<'tcx> {
+ pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
self.1
}
- pub fn force_stack<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
+ // FIXME remove
+ pub(crate) fn force_stack(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Pointer, Option<Value>) {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(value) => value,
+ CValueInner::ByRef(ptr, meta) => (ptr, meta),
CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => {
- let cplace = CPlace::new_stack_slot(fx, layout.ty);
+ let cplace = CPlace::new_stack_slot(fx, layout);
cplace.write_cvalue(fx, self);
- cplace.to_addr(fx)
+ (cplace.to_ptr(), None)
}
}
}
- pub fn try_to_addr(self) -> Option<Value> {
+ pub(crate) fn try_to_ptr(self) -> Option<(Pointer, Option<Value>)> {
match self.0 {
- CValueInner::ByRef(addr) => Some(addr),
+ CValueInner::ByRef(ptr, meta) => Some((ptr, meta)),
CValueInner::ByVal(_) | CValueInner::ByValPair(_, _) => None,
}
}
/// Load a value with layout.abi of scalar
- pub fn load_scalar<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
+ pub(crate) fn load_scalar(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> Value {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
- let scalar = match layout.abi {
- layout::Abi::Scalar(ref scalar) => scalar.clone(),
- _ => unreachable!(),
+ CValueInner::ByRef(ptr, None) => {
+ let clif_ty = match layout.abi {
+ Abi::Scalar(ref scalar) => scalar_to_clif_type(fx.tcx, scalar.clone()),
+ Abi::Vector { ref element, count } => {
+ scalar_to_clif_type(fx.tcx, element.clone())
+ .by(u16::try_from(count).unwrap())
+ .unwrap()
+ }
+ _ => unreachable!("{:?}", layout.ty),
};
- let clif_ty = scalar_to_clif_type(fx.tcx, scalar);
- fx.bcx.ins().load(clif_ty, MemFlags::new(), addr, 0)
+ let mut flags = MemFlags::new();
+ flags.set_notrap();
+ ptr.load(fx, clif_ty, flags)
}
CValueInner::ByVal(value) => value,
+ CValueInner::ByRef(_, Some(_)) => bug!("load_scalar for unsized value not allowed"),
CValueInner::ByValPair(_, _) => bug!("Please use load_scalar_pair for ByValPair"),
}
}
/// Load a value pair with layout.abi of scalar pair
- pub fn load_scalar_pair<'a>(
- self,
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ) -> (Value, Value) {
+ pub(crate) fn load_scalar_pair(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> (Value, Value) {
let layout = self.1;
match self.0 {
- CValueInner::ByRef(addr) => {
+ CValueInner::ByRef(ptr, None) => {
let (a_scalar, b_scalar) = match &layout.abi {
- layout::Abi::ScalarPair(a, b) => (a, b),
+ Abi::ScalarPair(a, b) => (a, b),
_ => unreachable!("load_scalar_pair({:?})", self),
};
let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
let clif_ty1 = scalar_to_clif_type(fx.tcx, a_scalar.clone());
let clif_ty2 = scalar_to_clif_type(fx.tcx, b_scalar.clone());
- let val1 = fx.bcx.ins().load(clif_ty1, MemFlags::new(), addr, 0);
- let val2 = fx.bcx.ins().load(clif_ty2, MemFlags::new(), addr, b_offset);
+ let mut flags = MemFlags::new();
+ flags.set_notrap();
+ let val1 = ptr.load(fx, clif_ty1, flags);
+ let val2 = ptr.offset(fx, b_offset).load(fx, clif_ty2, flags);
(val1, val2)
}
+ CValueInner::ByRef(_, Some(_)) => {
+ bug!("load_scalar_pair for unsized value not allowed")
+ }
CValueInner::ByVal(_) => bug!("Please use load_scalar for ByVal"),
CValueInner::ByValPair(val1, val2) => (val1, val2),
}
}
- pub fn value_field<'a>(
+ pub(crate) fn value_field(
self,
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
field: mir::Field,
) -> CValue<'tcx> {
let layout = self.1;
- let base = match self.0 {
- CValueInner::ByRef(addr) => addr,
- _ => bug!("place_field for {:?}", self),
- };
+ match self.0 {
+ CValueInner::ByVal(val) => match layout.abi {
+ Abi::Vector { element: _, count } => {
+ let count = u8::try_from(count).expect("SIMD type with more than 255 lanes???");
+ let field = u8::try_from(field.index()).unwrap();
+ assert!(field < count);
+ let lane = fx.bcx.ins().extractlane(val, field);
+ let field_layout = layout.field(&*fx, usize::from(field));
+ CValue::by_val(lane, field_layout)
+ }
+ _ => unreachable!("value_field for ByVal with abi {:?}", layout.abi),
+ },
+ CValueInner::ByValPair(val1, val2) => match layout.abi {
+ Abi::ScalarPair(_, _) => {
+ let val = match field.as_u32() {
+ 0 => val1,
+ 1 => val2,
+ _ => bug!("field should be 0 or 1"),
+ };
+ let field_layout = layout.field(&*fx, usize::from(field));
+ CValue::by_val(val, field_layout)
+ }
+ _ => unreachable!("value_field for ByValPair with abi {:?}", layout.abi),
+ },
+ CValueInner::ByRef(ptr, None) => {
+ let (field_ptr, field_layout) = codegen_field(fx, ptr, None, layout, field);
+ CValue::by_ref(field_ptr, field_layout)
+ }
+ CValueInner::ByRef(_, Some(_)) => todo!(),
+ }
+ }
- let (field_ptr, field_layout) = codegen_field(fx, base, None, layout, field);
- CValue::by_ref(field_ptr, field_layout)
+ /// Like [`CValue::value_field`] except handling ADTs containing a single array field in a way
+ /// such that you can access individual lanes.
+ pub(crate) fn value_lane(
+ self,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ lane_idx: u64,
+ ) -> CValue<'tcx> {
+ let layout = self.1;
+ assert!(layout.ty.is_simd());
+ let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
+ let lane_layout = fx.layout_of(lane_ty);
+ assert!(lane_idx < lane_count);
+ match self.0 {
+ CValueInner::ByVal(val) => match layout.abi {
+ Abi::Vector { element: _, count: _ } => {
+ assert!(lane_count <= u8::MAX.into(), "SIMD type with more than 255 lanes???");
+ let lane_idx = u8::try_from(lane_idx).unwrap();
+ let lane = fx.bcx.ins().extractlane(val, lane_idx);
+ CValue::by_val(lane, lane_layout)
+ }
+ _ => unreachable!("value_lane for ByVal with abi {:?}", layout.abi),
+ },
+ CValueInner::ByValPair(_, _) => unreachable!(),
+ CValueInner::ByRef(ptr, None) => {
+ let field_offset = lane_layout.size * lane_idx;
+ let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
+ CValue::by_ref(field_ptr, lane_layout)
+ }
+ CValueInner::ByRef(_, Some(_)) => unreachable!(),
+ }
}
- pub fn unsize_value<'a>(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
+ pub(crate) fn unsize_value(self, fx: &mut FunctionCx<'_, '_, 'tcx>, dest: CPlace<'tcx>) {
crate::unsize::coerce_unsized_into(fx, self, dest);
}
/// If `ty` is signed, `const_val` must already be sign extended.
- pub fn const_val<'a>(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ty: Ty<'tcx>,
- const_val: u128,
+ pub(crate) fn const_val(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ layout: TyAndLayout<'tcx>,
+ const_val: ty::ScalarInt,
) -> CValue<'tcx> {
- let clif_ty = fx.clif_type(ty).unwrap();
- let layout = fx.layout_of(ty);
+ assert_eq!(const_val.size(), layout.size, "{:#?}: {:?}", const_val, layout);
+ use cranelift_codegen::ir::immediates::{Ieee32, Ieee64};
- let val = match ty.kind {
- ty::TyKind::Uint(UintTy::U128) | ty::TyKind::Int(IntTy::I128) => {
+ let clif_ty = fx.clif_type(layout.ty).unwrap();
+
+ if let ty::Bool = layout.ty.kind() {
+ assert!(
+ const_val == ty::ScalarInt::FALSE || const_val == ty::ScalarInt::TRUE,
+ "Invalid bool 0x{:032X}",
+ const_val
+ );
+ }
+
+ let val = match layout.ty.kind() {
+ ty::Uint(UintTy::U128) | ty::Int(IntTy::I128) => {
+ let const_val = const_val.to_bits(layout.size).unwrap();
let lsb = fx.bcx.ins().iconst(types::I64, const_val as u64 as i64);
- let msb = fx
- .bcx
- .ins()
- .iconst(types::I64, (const_val >> 64) as u64 as i64);
+ let msb = fx.bcx.ins().iconst(types::I64, (const_val >> 64) as u64 as i64);
fx.bcx.ins().iconcat(lsb, msb)
}
- ty::TyKind::Bool => {
- assert!(
- const_val == 0 || const_val == 1,
- "Invalid bool 0x{:032X}",
- const_val
- );
- fx.bcx.ins().iconst(types::I8, const_val as i64)
+ ty::Bool | ty::Char | ty::Uint(_) | ty::Int(_) | ty::Ref(..) | ty::RawPtr(..) => {
+ fx.bcx.ins().iconst(clif_ty, const_val.to_bits(layout.size).unwrap() as i64)
+ }
+ ty::Float(FloatTy::F32) => {
+ fx.bcx.ins().f32const(Ieee32::with_bits(u32::try_from(const_val).unwrap()))
+ }
+ ty::Float(FloatTy::F64) => {
+ fx.bcx.ins().f64const(Ieee64::with_bits(u64::try_from(const_val).unwrap()))
}
- ty::TyKind::Uint(_) | ty::TyKind::Ref(..) | ty::TyKind::RawPtr(..) => fx
- .bcx
- .ins()
- .iconst(clif_ty, u64::try_from(const_val).expect("uint") as i64),
- ty::TyKind::Int(_) => fx.bcx.ins().iconst(clif_ty, const_val as i128 as i64),
_ => panic!(
- "CValue::const_val for non bool/integer/pointer type {:?} is not allowed",
- ty
+ "CValue::const_val for non bool/char/float/integer/pointer type {:?} is not allowed",
+ layout.ty
),
};
CValue::by_val(val, layout)
}
- pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
+ pub(crate) fn cast_pointer_to(self, layout: TyAndLayout<'tcx>) -> Self {
+ assert!(matches!(self.layout().ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)));
+ assert!(matches!(layout.ty.kind(), ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..)));
+ assert_eq!(self.layout().abi, layout.abi);
CValue(self.0, layout)
}
}
/// A place where you can write a value to or read a value from
#[derive(Debug, Copy, Clone)]
-pub struct CPlace<'tcx> {
+pub(crate) struct CPlace<'tcx> {
inner: CPlaceInner,
- layout: TyLayout<'tcx>,
+ layout: TyAndLayout<'tcx>,
}
#[derive(Debug, Copy, Clone)]
-pub enum CPlaceInner {
- Var(Local),
- Addr(Value, Option<Value>),
- Stack(StackSlot),
- NoPlace,
+pub(crate) enum CPlaceInner {
+ Var(Local, Variable),
+ VarPair(Local, Variable, Variable),
+ VarLane(Local, Variable, u8),
+ Addr(Pointer, Option<Value>),
}
impl<'tcx> CPlace<'tcx> {
- pub fn layout(&self) -> TyLayout<'tcx> {
+ pub(crate) fn layout(&self) -> TyAndLayout<'tcx> {
self.layout
}
- pub fn inner(&self) -> &CPlaceInner {
+ pub(crate) fn inner(&self) -> &CPlaceInner {
&self.inner
}
- pub fn no_place(layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace {
- inner: CPlaceInner::NoPlace,
- layout,
- }
- }
-
- pub fn new_stack_slot(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ty: Ty<'tcx>,
+ pub(crate) fn new_stack_slot(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ layout: TyAndLayout<'tcx>,
) -> CPlace<'tcx> {
- let layout = fx.layout_of(ty);
assert!(!layout.is_unsized());
if layout.size.bytes() == 0 {
return CPlace {
- inner: CPlaceInner::NoPlace,
+ inner: CPlaceInner::Addr(Pointer::dangling(layout.align.pref), None),
layout,
};
}
let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
kind: StackSlotKind::ExplicitSlot,
- size: layout.size.bytes() as u32,
+ // FIXME Don't force the size to a multiple of 16 bytes once Cranelift gets a way to
+ // specify stack slot alignment.
+ size: (u32::try_from(layout.size.bytes()).unwrap() + 15) / 16 * 16,
offset: None,
});
- CPlace {
- inner: CPlaceInner::Stack(stack_slot),
- layout,
- }
+ CPlace { inner: CPlaceInner::Addr(Pointer::stack_slot(stack_slot), None), layout }
}
- pub fn new_var(
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ pub(crate) fn new_var(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
local: Local,
- layout: TyLayout<'tcx>,
+ layout: TyAndLayout<'tcx>,
) -> CPlace<'tcx> {
- fx.bcx
- .declare_var(mir_var(local), fx.clif_type(layout.ty).unwrap());
- CPlace {
- inner: CPlaceInner::Var(local),
- layout,
- }
+ let var = Variable::with_u32(fx.next_ssa_var);
+ fx.next_ssa_var += 1;
+ fx.bcx.declare_var(var, fx.clif_type(layout.ty).unwrap());
+ CPlace { inner: CPlaceInner::Var(local, var), layout }
}
- pub fn for_addr(addr: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace {
- inner: CPlaceInner::Addr(addr, None),
- layout,
- }
+ pub(crate) fn new_var_pair(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ local: Local,
+ layout: TyAndLayout<'tcx>,
+ ) -> CPlace<'tcx> {
+ let var1 = Variable::with_u32(fx.next_ssa_var);
+ fx.next_ssa_var += 1;
+ let var2 = Variable::with_u32(fx.next_ssa_var);
+ fx.next_ssa_var += 1;
+
+ let (ty1, ty2) = fx.clif_pair_type(layout.ty).unwrap();
+ fx.bcx.declare_var(var1, ty1);
+ fx.bcx.declare_var(var2, ty2);
+ CPlace { inner: CPlaceInner::VarPair(local, var1, var2), layout }
}
- pub fn for_addr_with_extra(addr: Value, extra: Value, layout: TyLayout<'tcx>) -> CPlace<'tcx> {
- CPlace {
- inner: CPlaceInner::Addr(addr, Some(extra)),
- layout,
- }
+ pub(crate) fn for_ptr(ptr: Pointer, layout: TyAndLayout<'tcx>) -> CPlace<'tcx> {
+ CPlace { inner: CPlaceInner::Addr(ptr, None), layout }
+ }
+
+ pub(crate) fn for_ptr_with_extra(
+ ptr: Pointer,
+ extra: Value,
+ layout: TyAndLayout<'tcx>,
+ ) -> CPlace<'tcx> {
+ CPlace { inner: CPlaceInner::Addr(ptr, Some(extra)), layout }
}
- pub fn to_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> CValue<'tcx> {
+ pub(crate) fn to_cvalue(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> CValue<'tcx> {
let layout = self.layout();
match self.inner {
- CPlaceInner::Var(var) => CValue::by_val(fx.bcx.use_var(mir_var(var)), layout),
- CPlaceInner::Addr(addr, extra) => {
- assert!(extra.is_none(), "unsized values are not yet supported");
- CValue::by_ref(addr, layout)
+ CPlaceInner::Var(_local, var) => {
+ let val = fx.bcx.use_var(var);
+ //fx.bcx.set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
+ CValue::by_val(val, layout)
+ }
+ CPlaceInner::VarPair(_local, var1, var2) => {
+ let val1 = fx.bcx.use_var(var1);
+ //fx.bcx.set_val_label(val1, cranelift_codegen::ir::ValueLabel::new(var1.index()));
+ let val2 = fx.bcx.use_var(var2);
+ //fx.bcx.set_val_label(val2, cranelift_codegen::ir::ValueLabel::new(var2.index()));
+ CValue::by_val_pair(val1, val2, layout)
+ }
+ CPlaceInner::VarLane(_local, var, lane) => {
+ let val = fx.bcx.use_var(var);
+ //fx.bcx.set_val_label(val, cranelift_codegen::ir::ValueLabel::new(var.index()));
+ let val = fx.bcx.ins().extractlane(val, lane);
+ CValue::by_val(val, layout)
+ }
+ CPlaceInner::Addr(ptr, extra) => {
+ if let Some(extra) = extra {
+ CValue::by_ref_unsized(ptr, extra, layout)
+ } else {
+ CValue::by_ref(ptr, layout)
+ }
}
- CPlaceInner::Stack(stack_slot) => CValue::by_ref(
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- layout,
- ),
- CPlaceInner::NoPlace => CValue::by_ref(
- fx.bcx
- .ins()
- .iconst(fx.pointer_type, fx.pointer_type.bytes() as i64),
- layout,
- ),
}
}
- pub fn to_addr(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> Value {
- match self.to_addr_maybe_unsized(fx) {
- (addr, None) => addr,
+ pub(crate) fn to_ptr(self) -> Pointer {
+ match self.to_ptr_maybe_unsized() {
+ (ptr, None) => ptr,
(_, Some(_)) => bug!("Expected sized cplace, found {:?}", self),
}
}
- pub fn to_addr_maybe_unsized(
- self,
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
- ) -> (Value, Option<Value>) {
+ pub(crate) fn to_ptr_maybe_unsized(self) -> (Pointer, Option<Value>) {
match self.inner {
- CPlaceInner::Addr(addr, extra) => (addr, extra),
- CPlaceInner::Stack(stack_slot) => (
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
- None,
- ),
- CPlaceInner::NoPlace => {
- (
- fx.bcx.ins().iconst(
- fx.pointer_type,
- i64::try_from(self.layout.align.pref.bytes()).unwrap(),
- ),
- None
- )
- }
- CPlaceInner::Var(_) => bug!("Expected CPlace::Addr, found CPlace::Var"),
+ CPlaceInner::Addr(ptr, extra) => (ptr, extra),
+ CPlaceInner::Var(_, _)
+ | CPlaceInner::VarPair(_, _, _)
+ | CPlaceInner::VarLane(_, _, _) => bug!("Expected CPlace::Addr, found {:?}", self),
}
}
- pub fn write_cvalue(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, from: CValue<'tcx>) {
- use rustc::hir::Mutability::*;
+ pub(crate) fn write_cvalue(self, fx: &mut FunctionCx<'_, '_, 'tcx>, from: CValue<'tcx>) {
+ assert_assignable(fx, from.layout().ty, self.layout().ty);
- let from_ty = from.layout().ty;
- let to_ty = self.layout().ty;
+ self.write_cvalue_maybe_transmute(fx, from, "write_cvalue");
+ }
- fn assert_assignable<'tcx>(
- fx: &FunctionCx<'_, 'tcx, impl Backend>,
- from_ty: Ty<'tcx>,
- to_ty: Ty<'tcx>,
+ pub(crate) fn write_cvalue_transmute(
+ self,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ from: CValue<'tcx>,
+ ) {
+ self.write_cvalue_maybe_transmute(fx, from, "write_cvalue_transmute");
+ }
+
+ fn write_cvalue_maybe_transmute(
+ self,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ from: CValue<'tcx>,
+ method: &'static str,
+ ) {
+ fn transmute_value<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ var: Variable,
+ data: Value,
+ dst_ty: Type,
) {
- match (&from_ty.kind, &to_ty.kind) {
- (ty::Ref(_, t, Immutable), ty::Ref(_, u, Immutable))
- | (ty::Ref(_, t, Mutable), ty::Ref(_, u, Immutable))
- | (ty::Ref(_, t, Mutable), ty::Ref(_, u, Mutable)) => {
- assert_assignable(fx, t, u);
- // &mut T -> &T is allowed
- // &'a T -> &'b T is allowed
- }
- (ty::Ref(_, _, Immutable), ty::Ref(_, _, Mutable)) => panic!(
- "Cant assign value of type {} to place of type {}",
- from_ty, to_ty
- ),
- (ty::FnPtr(_), ty::FnPtr(_)) => {
- let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
- ParamEnv::reveal_all(),
- &from_ty.fn_sig(fx.tcx),
- );
- let to_sig = fx.tcx.normalize_erasing_late_bound_regions(
- ParamEnv::reveal_all(),
- &to_ty.fn_sig(fx.tcx),
- );
- assert_eq!(
- from_sig, to_sig,
- "Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
- from_sig, to_sig, fx,
- );
- // fn(&T) -> for<'l> fn(&'l T) is allowed
- }
- (ty::Dynamic(from_traits, _), ty::Dynamic(to_traits, _)) => {
- let from_traits = fx
- .tcx
- .normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), from_traits);
- let to_traits = fx
- .tcx
- .normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to_traits);
- assert_eq!(
- from_traits, to_traits,
- "Can't write trait object of incompatible traits {:?} to place with traits {:?}\n\n{:#?}",
- from_traits, to_traits, fx,
- );
- // dyn for<'r> Trait<'r> -> dyn Trait<'_> is allowed
+ let src_ty = fx.bcx.func.dfg.value_type(data);
+ assert_eq!(
+ src_ty.bytes(),
+ dst_ty.bytes(),
+ "write_cvalue_transmute: {:?} -> {:?}",
+ src_ty,
+ dst_ty,
+ );
+ let data = match (src_ty, dst_ty) {
+ (_, _) if src_ty == dst_ty => data,
+
+ // This is a `write_cvalue_transmute`.
+ (types::I32, types::F32)
+ | (types::F32, types::I32)
+ | (types::I64, types::F64)
+ | (types::F64, types::I64) => fx.bcx.ins().bitcast(dst_ty, data),
+ _ if src_ty.is_vector() && dst_ty.is_vector() => {
+ fx.bcx.ins().raw_bitcast(dst_ty, data)
}
- _ => {
- assert_eq!(
- from_ty,
- to_ty,
- "Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
- from_ty,
- to_ty,
- fx,
- );
+ _ if src_ty.is_vector() || dst_ty.is_vector() => {
+ // FIXME do something more efficient for transmutes between vectors and integers.
+ let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
+ kind: StackSlotKind::ExplicitSlot,
+ // FIXME Don't force the size to a multiple of 16 bytes once Cranelift gets a way to
+ // specify stack slot alignment.
+ size: (src_ty.bytes() + 15) / 16 * 16,
+ offset: None,
+ });
+ let ptr = Pointer::stack_slot(stack_slot);
+ ptr.store(fx, data, MemFlags::trusted());
+ ptr.load(fx, dst_ty, MemFlags::trusted())
}
- }
+
+ // `CValue`s should never contain SSA-only types, so if you ended
+ // up here having seen an error like `B1 -> I8`, then before
+ // calling `write_cvalue` you need to add a `bint` instruction.
+ _ => unreachable!("write_cvalue_transmute: {:?} -> {:?}", src_ty, dst_ty),
+ };
+ //fx.bcx.set_val_label(data, cranelift_codegen::ir::ValueLabel::new(var.index()));
+ fx.bcx.def_var(var, data);
}
- assert_assignable(fx, from_ty, to_ty);
+ assert_eq!(self.layout().size, from.layout().size);
+
+ if fx.clif_comments.enabled() {
+ use cranelift_codegen::cursor::{Cursor, CursorPosition};
+ let cur_block = match fx.bcx.cursor().position() {
+ CursorPosition::After(block) => block,
+ _ => unreachable!(),
+ };
+ fx.add_comment(
+ fx.bcx.func.layout.last_inst(cur_block).unwrap(),
+ format!(
+ "{}: {:?}: {:?} <- {:?}: {:?}",
+ method,
+ self.inner(),
+ self.layout().ty,
+ from.0,
+ from.layout().ty
+ ),
+ );
+ }
let dst_layout = self.layout();
- let addr = match self.inner {
- CPlaceInner::Var(var) => {
- let data = from.load_scalar(fx);
- fx.bcx.def_var(mir_var(var), data);
+ let to_ptr = match self.inner {
+ CPlaceInner::Var(_local, var) => {
+ let data = CValue(from.0, dst_layout).load_scalar(fx);
+ let dst_ty = fx.clif_type(self.layout().ty).unwrap();
+ transmute_value(fx, var, data, dst_ty);
return;
}
- CPlaceInner::Addr(addr, None) => addr,
- CPlaceInner::Stack(stack_slot) => {
- fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0)
+ CPlaceInner::VarPair(_local, var1, var2) => {
+ let (data1, data2) = CValue(from.0, dst_layout).load_scalar_pair(fx);
+ let (dst_ty1, dst_ty2) = fx.clif_pair_type(self.layout().ty).unwrap();
+ transmute_value(fx, var1, data1, dst_ty1);
+ transmute_value(fx, var2, data2, dst_ty2);
+ return;
}
- CPlaceInner::NoPlace => {
- if dst_layout.abi != Abi::Uninhabited {
- assert_eq!(dst_layout.size.bytes(), 0, "{:?}", dst_layout);
- }
+ CPlaceInner::VarLane(_local, var, lane) => {
+ let data = from.load_scalar(fx);
+
+ // First get the old vector
+ let vector = fx.bcx.use_var(var);
+ //fx.bcx.set_val_label(vector, cranelift_codegen::ir::ValueLabel::new(var.index()));
+
+ // Next insert the written lane into the vector
+ let vector = fx.bcx.ins().insertlane(vector, data, lane);
+
+ // Finally write the new vector
+ //fx.bcx.set_val_label(vector, cranelift_codegen::ir::ValueLabel::new(var.index()));
+ fx.bcx.def_var(var, vector);
+
return;
}
+ CPlaceInner::Addr(ptr, None) => {
+ if dst_layout.size == Size::ZERO || dst_layout.abi == Abi::Uninhabited {
+ return;
+ }
+ ptr
+ }
CPlaceInner::Addr(_, Some(_)) => bug!("Can't write value to unsized place {:?}", self),
};
+ let mut flags = MemFlags::new();
+ flags.set_notrap();
+ match from.layout().abi {
+ // FIXME make Abi::Vector work too
+ Abi::Scalar(_) => {
+ let val = from.load_scalar(fx);
+ to_ptr.store(fx, val, flags);
+ return;
+ }
+ Abi::ScalarPair(ref a_scalar, ref b_scalar) => {
+ let (value, extra) = from.load_scalar_pair(fx);
+ let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
+ to_ptr.store(fx, value, flags);
+ to_ptr.offset(fx, b_offset).store(fx, extra, flags);
+ return;
+ }
+ _ => {}
+ }
+
match from.0 {
CValueInner::ByVal(val) => {
- fx.bcx.ins().store(MemFlags::new(), val, addr, 0);
+ to_ptr.store(fx, val, flags);
}
- CValueInner::ByValPair(value, extra) => match dst_layout.abi {
- Abi::ScalarPair(ref a_scalar, ref b_scalar) => {
- let b_offset = scalar_pair_calculate_b_offset(fx.tcx, a_scalar, b_scalar);
- fx.bcx.ins().store(MemFlags::new(), value, addr, 0);
- fx.bcx.ins().store(MemFlags::new(), extra, addr, b_offset);
- }
- _ => bug!(
- "Non ScalarPair abi {:?} for ByValPair CValue",
- dst_layout.abi
- ),
- },
- CValueInner::ByRef(from_addr) => {
+ CValueInner::ByValPair(_, _) => {
+ bug!("Non ScalarPair abi {:?} for ByValPair CValue", dst_layout.abi);
+ }
+ CValueInner::ByRef(from_ptr, None) => {
+ let from_addr = from_ptr.get_addr(fx);
+ let to_addr = to_ptr.get_addr(fx);
let src_layout = from.1;
let size = dst_layout.size.bytes();
let src_align = src_layout.align.abi.bytes() as u8;
let dst_align = dst_layout.align.abi.bytes() as u8;
- fx.bcx.emit_small_memcpy(
+ fx.bcx.emit_small_memory_copy(
fx.module.target_config(),
- addr,
+ to_addr,
from_addr,
size,
dst_align,
src_align,
+ true,
+ MemFlags::trusted(),
);
}
+ CValueInner::ByRef(_, Some(_)) => todo!(),
}
}
- pub fn place_field(
+ pub(crate) fn place_field(
self,
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
field: mir::Field,
) -> CPlace<'tcx> {
let layout = self.layout();
- let (base, extra) = self.to_addr_maybe_unsized(fx);
+
+ match self.inner {
+ CPlaceInner::Var(local, var) => {
+ if let Abi::Vector { .. } = layout.abi {
+ return CPlace {
+ inner: CPlaceInner::VarLane(local, var, field.as_u32().try_into().unwrap()),
+ layout: layout.field(fx, field.as_u32().try_into().unwrap()),
+ };
+ }
+ }
+ CPlaceInner::VarPair(local, var1, var2) => {
+ let layout = layout.field(&*fx, field.index());
+
+ match field.as_u32() {
+ 0 => return CPlace { inner: CPlaceInner::Var(local, var1), layout },
+ 1 => return CPlace { inner: CPlaceInner::Var(local, var2), layout },
+ _ => unreachable!("field should be 0 or 1"),
+ }
+ }
+ _ => {}
+ }
+
+ let (base, extra) = self.to_ptr_maybe_unsized();
let (field_ptr, field_layout) = codegen_field(fx, base, extra, layout, field);
if field_layout.is_unsized() {
- CPlace::for_addr_with_extra(field_ptr, extra.unwrap(), field_layout)
+ CPlace::for_ptr_with_extra(field_ptr, extra.unwrap(), field_layout)
} else {
- CPlace::for_addr(field_ptr, field_layout)
+ CPlace::for_ptr(field_ptr, field_layout)
+ }
+ }
+
+ /// Like [`CPlace::place_field`] except handling ADTs containing a single array field in a way
+ /// such that you can access individual lanes.
+ pub(crate) fn place_lane(
+ self,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ lane_idx: u64,
+ ) -> CPlace<'tcx> {
+ let layout = self.layout();
+ assert!(layout.ty.is_simd());
+ let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
+ let lane_layout = fx.layout_of(lane_ty);
+ assert!(lane_idx < lane_count);
+
+ match self.inner {
+ CPlaceInner::Var(local, var) => {
+ assert!(matches!(layout.abi, Abi::Vector { .. }));
+ CPlace {
+ inner: CPlaceInner::VarLane(local, var, lane_idx.try_into().unwrap()),
+ layout: lane_layout,
+ }
+ }
+ CPlaceInner::VarPair(_, _, _) => unreachable!(),
+ CPlaceInner::VarLane(_, _, _) => unreachable!(),
+ CPlaceInner::Addr(ptr, None) => {
+ let field_offset = lane_layout.size * lane_idx;
+ let field_ptr = ptr.offset_i64(fx, i64::try_from(field_offset.bytes()).unwrap());
+ CPlace::for_ptr(field_ptr, lane_layout)
+ }
+ CPlaceInner::Addr(_, Some(_)) => unreachable!(),
}
}
- pub fn place_index(
+ pub(crate) fn place_index(
self,
- fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
index: Value,
) -> CPlace<'tcx> {
- let (elem_layout, addr) = match self.layout().ty.kind {
- ty::Array(elem_ty, _) => (fx.layout_of(elem_ty), self.to_addr(fx)),
- ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_addr_maybe_unsized(fx).0),
+ let (elem_layout, ptr) = match self.layout().ty.kind() {
+ ty::Array(elem_ty, _) => (fx.layout_of(elem_ty), self.to_ptr()),
+ ty::Slice(elem_ty) => (fx.layout_of(elem_ty), self.to_ptr_maybe_unsized().0),
_ => bug!("place_index({:?})", self.layout().ty),
};
- let offset = fx
- .bcx
- .ins()
- .imul_imm(index, elem_layout.size.bytes() as i64);
+ let offset = fx.bcx.ins().imul_imm(index, elem_layout.size.bytes() as i64);
- CPlace::for_addr(fx.bcx.ins().iadd(addr, offset), elem_layout)
+ CPlace::for_ptr(ptr.offset_value(fx, offset), elem_layout)
}
- pub fn place_deref(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>) -> CPlace<'tcx> {
+ pub(crate) fn place_deref(self, fx: &mut FunctionCx<'_, '_, 'tcx>) -> CPlace<'tcx> {
let inner_layout = fx.layout_of(self.layout().ty.builtin_deref(true).unwrap().ty);
if has_ptr_meta(fx.tcx, inner_layout.ty) {
let (addr, extra) = self.to_cvalue(fx).load_scalar_pair(fx);
- CPlace::for_addr_with_extra(addr, extra, inner_layout)
+ CPlace::for_ptr_with_extra(Pointer::new(addr), extra, inner_layout)
} else {
- CPlace::for_addr(self.to_cvalue(fx).load_scalar(fx), inner_layout)
+ CPlace::for_ptr(Pointer::new(self.to_cvalue(fx).load_scalar(fx)), inner_layout)
}
}
- pub fn write_place_ref(self, fx: &mut FunctionCx<'_, 'tcx, impl Backend>, dest: CPlace<'tcx>) {
+ pub(crate) fn place_ref(
+ self,
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ layout: TyAndLayout<'tcx>,
+ ) -> CValue<'tcx> {
if has_ptr_meta(fx.tcx, self.layout().ty) {
- let (value, extra) = self.to_addr_maybe_unsized(fx);
- let ptr = CValue::by_val_pair(
- value,
+ let (ptr, extra) = self.to_ptr_maybe_unsized();
+ CValue::by_val_pair(
+ ptr.get_addr(fx),
extra.expect("unsized type without metadata"),
- dest.layout(),
- );
- dest.write_cvalue(fx, ptr);
+ layout,
+ )
} else {
- let ptr = CValue::by_val(self.to_addr(fx), dest.layout());
- dest.write_cvalue(fx, ptr);
+ CValue::by_val(self.to_ptr().get_addr(fx), layout)
}
}
- pub fn unchecked_cast_to(self, layout: TyLayout<'tcx>) -> Self {
- assert!(!self.layout().is_unsized());
- match self.inner {
- CPlaceInner::NoPlace => {
- assert!(layout.size.bytes() == 0);
- }
- _ => {}
- }
- CPlace {
- inner: self.inner,
- layout,
- }
- }
-
- pub fn downcast_variant(
+ pub(crate) fn downcast_variant(
self,
- fx: &FunctionCx<'_, 'tcx, impl Backend>,
+ fx: &FunctionCx<'_, '_, 'tcx>,
variant: VariantIdx,
) -> Self {
+ assert!(!self.layout().is_unsized());
let layout = self.layout().for_variant(fx, variant);
- self.unchecked_cast_to(layout)
+ CPlace { inner: self.inner, layout }
+ }
+}
+
+#[track_caller]
+pub(crate) fn assert_assignable<'tcx>(
+ fx: &FunctionCx<'_, '_, 'tcx>,
+ from_ty: Ty<'tcx>,
+ to_ty: Ty<'tcx>,
+) {
+ match (from_ty.kind(), to_ty.kind()) {
+ (ty::Ref(_, a, _), ty::Ref(_, b, _))
+ | (
+ ty::RawPtr(TypeAndMut { ty: a, mutbl: _ }),
+ ty::RawPtr(TypeAndMut { ty: b, mutbl: _ }),
+ ) => {
+ assert_assignable(fx, a, b);
+ }
+ (ty::Ref(_, a, _), ty::RawPtr(TypeAndMut { ty: b, mutbl: _ }))
+ | (ty::RawPtr(TypeAndMut { ty: a, mutbl: _ }), ty::Ref(_, b, _)) => {
+ assert_assignable(fx, a, b);
+ }
+ (ty::FnPtr(_), ty::FnPtr(_)) => {
+ let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
+ ParamEnv::reveal_all(),
+ from_ty.fn_sig(fx.tcx),
+ );
+ let to_sig = fx
+ .tcx
+ .normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to_ty.fn_sig(fx.tcx));
+ assert_eq!(
+ from_sig, to_sig,
+ "Can't write fn ptr with incompatible sig {:?} to place with sig {:?}\n\n{:#?}",
+ from_sig, to_sig, fx,
+ );
+ // fn(&T) -> for<'l> fn(&'l T) is allowed
+ }
+ (&ty::Dynamic(from_traits, _), &ty::Dynamic(to_traits, _)) => {
+ for (from, to) in from_traits.iter().zip(to_traits) {
+ let from =
+ fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), from);
+ let to = fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to);
+ assert_eq!(
+ from, to,
+ "Can't write trait object of incompatible traits {:?} to place with traits {:?}\n\n{:#?}",
+ from_traits, to_traits, fx,
+ );
+ }
+ // dyn for<'r> Trait<'r> -> dyn Trait<'_> is allowed
+ }
+ (&ty::Adt(adt_def_a, substs_a), &ty::Adt(adt_def_b, substs_b))
+ if adt_def_a.did == adt_def_b.did =>
+ {
+ let mut types_a = substs_a.types();
+ let mut types_b = substs_b.types();
+ loop {
+ match (types_a.next(), types_b.next()) {
+ (Some(a), Some(b)) => assert_assignable(fx, a, b),
+ (None, None) => return,
+ (Some(_), None) | (None, Some(_)) => panic!("{:#?}/{:#?}", from_ty, to_ty),
+ }
+ }
+ }
+ _ => {
+ assert_eq!(
+ from_ty, to_ty,
+ "Can't write value with incompatible type {:?} to place with type {:?}\n\n{:#?}",
+ from_ty, to_ty, fx,
+ );
+ }
}
}